Question

which of these changes with time for a first order
1) rate of reaction
2 ) rate constant
3) half life

A) 1 only
B) 3 only
C) 1&2 only
D) 2 &3 only​

Answer 1

Answer:

1and2 yes because of the rate

Answer 2

Answer:

A) 1 only

The rate of reaction changes with time for the first order.

Explanation:

• The first-order reaction is the reaction whose rate depends upon the first power of the concentration of reactants. The concentration of reactants decreases exponentially with time.

       $-\frac{d[A]}{dt} = [A]$

• The rate constant of a reaction is the rate of the reaction when the concentration of each reactant is unity. It depends only on temperature.

• The half-life of a reaction is the time required for the reaction to be half completed. It is related to the corresponding rate constant.

       The half-life for a first-order reaction is given by the expression

       $t1/2 = \frac{0.693}{k}$